import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'
Vue.use(VueRouter)

const router = new VueRouter ({
  routes: [ 
    { path: '/', redirect: '/login' },
    { path: '/login', component: Login },
    { path: '/home', component: Home }
  ]
})

// 挂载路由导航守卫
router.beforeEach((to,from,next) => {
  // to将要访问的路径
  // from 代表从哪个路径跳转而来
  // next 是一个函数，表示放行
  // next() 放行 next('/login') 强制跳转

  // 如果访问登录页直接放行
  if(to.path ==='/login') return next();
  // 获取token
  const tokenStr = window.sessionStorage.getItem('token')
  if (!tokenStr) return next('/login')
  next()
})

export default router
